Answer:
Answer 1: there are 4 valence electrons in the Example A
Answer 2: The d subshell can hold up 10 electron: True
Answer 3: The element argon has 8 valence electrons.
Explanation:
Answer 1: The example A has four shells, and in the forth shell, it holds a total of 2
+
2
=
4
, so it has 4 valence electrons.
Answer 2: As you can see in the image, the d subshell has 5 different areas where you likely find a pair of electrons. In each area you can find until 2 electrons, so 5 x 2 = 10 electrons can be hold up in the d subshell.
Answer 3: Noble gases like argon have 8 valence electrons and its electron configuration is [
N
e
]
3
s
2
3
p
6
